1/*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20*/
21#include "SDL_internal.h"
22
23#ifdef SDL_VIDEO_DRIVER_OFFSCREEN
24
25#include "../SDL_sysvideo.h"
26#include "../../SDL_properties_c.h"
27#include "SDL_offscreenframebuffer_c.h"
28
29#define OFFSCREEN_SURFACE "SDL.internal.window.surface"
30
31
32bool SDL_OFFSCREEN_CreateWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window, SDL_PixelFormat *format, void **pixels, int *pitch)
33{
34 SDL_Surface *surface;
35 const SDL_PixelFormat surface_format = SDL_PIXELFORMAT_XRGB8888;
36 int w, h;
37
38 // Create a new framebuffer
39 SDL_GetWindowSizeInPixels(window, &w, &h);
40 surface = SDL_CreateSurface(w, h, surface_format);
41 if (!surface) {
42 return false;
43 }
44
45 // Save the info and return!
46 SDL_SetSurfaceProperty(SDL_GetWindowProperties(window), OFFSCREEN_SURFACE, surface);
47 *format = surface_format;
48 *pixels = surface->pixels;
49 *pitch = surface->pitch;
50
51 return true;
52}
53
54bool SDL_OFFSCREEN_UpdateWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window, const SDL_Rect *rects, int numrects)
55{
56 static int frame_number;
57 SDL_Surface *surface;
58
59 surface = (SDL_Surface *)SDL_GetPointerProperty(SDL_GetWindowProperties(window), OFFSCREEN_SURFACE, NULL);
60 if (!surface) {
61 return SDL_SetError("Couldn't find offscreen surface for window");
62 }
63
64 // Send the data to the display
65 if (SDL_GetHintBoolean(SDL_HINT_VIDEO_OFFSCREEN_SAVE_FRAMES, false)) {
66 char file[128];
67 (void)SDL_snprintf(file, sizeof(file), "SDL_window%" SDL_PRIu32 "-%8.8d.bmp",
68 SDL_GetWindowID(window), ++frame_number);
69 SDL_SaveBMP(surface, file);
70 }
71 return true;
72}
73
74void SDL_OFFSCREEN_DestroyWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window)
75{
76 SDL_ClearProperty(SDL_GetWindowProperties(window), OFFSCREEN_SURFACE);
77}
78
79#endif // SDL_VIDEO_DRIVER_OFFSCREEN
80